Figure 5.

STIL promotes in vitro pollen tube germination in tomato. A, Mature pollen was germinated in vitro for 3 h in the presence of increasing amounts of partially purified STIL (C18 percolate). The concentration of STIL is expressed as Abs280 units/μl of Pollen Germination Medium. The Table summarizes the results. SE, standard error; n, number of replicates from independent experiments; *, significant differences relative to water control (*, p < 0.01; **, p < 0.001). B, Pollen tube length fold-increase (left panel) and growth rate (right panel) for different STIL concentrations. The standard error for each average (table in A) was used to calculate the error bars, using error propagation (partial derivatives).